<template>
    <view class="u-keyboard" @touchmove.stop.prevent="() => {}">
        <view class="u-keyboard-grids">
            <view
                v-for="(item, index) in numList"
                :key="index"
                :class="[btnBgGray(index) ? 'u-bg-gray' : '', index <= 2 ? 'u-border-top' : '', index < 9 ? 'u-border-bottom' : '', (index + 1) % 3 != 0 ? 'u-border-right' : '']"
                :hover-class="hoverClass(index)"
                :hover-stay-time="100"
                :style="[itemStyle(index)]"
                class="u-keyboard-grids-item"
                @tap="keyboardClick(item)">
                <view class="u-keyboard-grids-btn">{{ item }}</view>
            </view>
            <view :hover-stay-time="100" class="u-keyboard-grids-item u-bg-gray" hover-class="u-hover-class"
                  @touchend="clearTimer"
                  @touchstart.stop="backspaceClick">
                <view class="u-keyboard-back u-keyboard-grids-btn">
                    <u-icon :bold="true" :size="38" name="backspace"></u-icon>
                </view>
            </view>
        </view>
    </view>
</template>

<script>
export default {
    props: {
        // 键盘的类型，number-数字键盘，card-身份证键盘
        mode: {
            type: String,
            default: 'number'
        },
        // 是否显示键盘的"."符号
        dotEnabled: {
            type: Boolean,
            default: true
        },
        // 是否打乱键盘按键的顺序
        random: {
            type: Boolean,
            default: false
        }
    },
    data() {
        return {
            backspace: 'backspace', // 退格键内容
            dot: '.', // 点
            timer: null, // 长按多次删除的事件监听
            cardX: 'X' // 身份证的X符号
        };
    },
    computed: {
        // 键盘需要显示的内容
        numList() {
            let tmp = [];
            if (!this.dotEnabled && this.mode == 'number') {
                if (!this.random) {
                    return [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
                } else {
                    return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
                }
            } else if (this.dotEnabled && this.mode == 'number') {
                if (!this.random) {
                    return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0];
                } else {
                    return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0]);
                }
            } else if (this.mode == 'card') {
                if (!this.random) {
                    return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0];
                } else {
                    return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0]);
                }
            }
        },
        // 按键的样式，在非乱序&&数字键盘&&不显示点按钮时，index为9时，按键占位两个空间
        itemStyle() {
            return index => {
                let style = {};
                if (this.mode == 'number' && !this.dotEnabled && index == 9) style.flex = '0 0 66.6666666666%';
                return style;
            };
        },
        // 是否让按键显示灰色，只在非乱序&&数字键盘&&且允许点按键的时候
        btnBgGray() {
            return index => {
                if (!this.random && index == 9 && (this.mode != 'number' || (this.mode == 'number' && this.dotEnabled))) return true;
                else return false;
            };
        },
        hoverClass() {
            return index => {
                if (!this.random && index == 9 && (this.mode == 'number' && this.dotEnabled || this.mode == 'card')) return 'u-hover-class';
                else return 'u-keyboard-hover';
            }
        }
    },
    methods: {
        // 点击退格键
        backspaceClick() {
            this.$emit('backspace');
            clearInterval(this.timer); //再次清空定时器，防止重复注册定时器
            this.timer = null;
            this.timer = setInterval(() => {
                this.$emit('backspace');
            }, 250);
        },
        clearTimer() {
            clearInterval(this.timer);
            this.timer = null;
        },
        // 获取键盘显示的内容
        keyboardClick(val) {
            // 允许键盘显示点模式和触发非点按键时，将内容转为数字类型
            if (this.dotEnabled && val != this.dot && val != this.cardX) val = Number(val);
            this.$emit('change', val);
        }
    }
};
</script>

<style lang="scss" scoped>
@import "../../libs/css/style.components.scss";

.u-keyboard {
    position: relative;
    z-index: 1003;
}

.u-keyboard-grids {
    @include vue-flex;
    flex-wrap: wrap;
}

.u-keyboard-grids-item {
    flex: 0 0 33.3333333333%;
    text-align: center;
    font-size: 50 rpx;
    color: #333;
    @include vue-flex;
    align-items: center;
    justify-content: center;
    height: 110 rpx;
    font-weight: 500;
}

.u-bg-gray {
    background-color: $u-border-color;
}

.u-keyboard-back {
    font-size: 36 rpx;
}

.u-keyboard-hover {
    background-color: #e7e6eb;
}
</style>
